code: def test_assert_is_bbox_dataset(self):
      if self.valid:
          assert_is_bbox_dataset(self.dataset, 20)
      else:
          with self.assertRaises(AssertionError):
              assert_is_bbox_dataset(self.dataset, 20)
  
imports: import numpy
  import unittest
  from chainer.dataset import DatasetMixin
  from chainercv.utils import assert_is_bbox_dataset
  from chainercv.utils import generate_random_bbox
  from chainercv.utils import testing
label_desc: Use image node_id 1 for calling the TestAssertIsBboxDataset obj's underlying member method code with example usage: obj.test_assert_is_bbox_dataset() without return types